[FSDP] Kill config_auto_wrap_policy, remove policy from enable_wrap, (#69357)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/69357
Since we only want to support enable_wrap() and wrap() manual wrapping
APIs without them accepting auto_wrap_policy, remove all this unneeded code.
ghstack-source-id: 144807951
Test Plan: CI
Reviewed By: zhaojuanmao
Differential Revision: D32826318
fbshipit-source-id: 6526e700ebdf132cbb10439698f5c97ce083cd3d
